Inspection System and Inspection Method

1. An inspection system comprising: a connector coupled to a plurality of optical fibers: a detection device arranged between the connector and a port of a computer and configured to guide a light passed through the plurality of optical fibers and output from the connecter, in a first direction to the port and in a second direction to a plurality of diodes included in the detection device; and a determination device coupled to the detection device and configured to determine whether there is a contaminant between the connector and the port, the plurality of diodes are configured to convert the light to an electrical signal indicating intensity and distribution of the light, and the determination device includes a processor configured to determine whether there is the contaminant between the connector and the port, based on the intensity and distribution of the light, which are indicated by the electrical signal; wherein the processor is configured to: detect first diodes that have received the light that was reflected by the contact surface among the plurality of diodes and second diodes that have not received the light that was reflected by the contact surface among the plurality of diodes, specify, in each of arrays of ones of the plurality of diodes, which are arranged in lines in the first direction, for each pair of the first diodes between which at least one of the second diodes is arranged, the number of the second diodes that are arranged between each pair of the first diodes, and determine that the contaminant is between the connector and the port when the number of the specified second diodes is different among the pairs of the first diodes.

2. The inspection system according to claim 1 , wherein the detection device includes a housing including two members having different refractive indexes, and a contact surface of the two members is arranged so as to be oblique to an optical path of the light that is output from each of the plurality of optical fibers.

3. The inspection system according to claim 1 , wherein the contact surface reflects the light that has been output from each of the plurality of optical fibers and the light that has been reflected by the port to cause the lights to enter the plurality of diodes.

4. The inspection system according to claim 3 , wherein the plurality of diodes is arranged such that at least one of the diodes is located in a location which the light that has been reflected by the contact surface enters when there is not the dart between the connector and the port.

5. The inspection system according to claim 3 , wherein the plurality of diodes is arranged such that the light has been reflected by the contact surface enters through at least one of the plurality of diodes where the contaminant is located.

6. The inspection system according to claim 1 , wherein the detection device further includes a converter that converts the electrical signal from an analog signal to a digital signal.

7. The inspection system according to claim 1 , wherein the processor is configured to: calculate, for each of the plurality of diodes, a difference between a value of an electrical signal that has been output from the diode and a value of an electrical signal that is output from the diode when there is not dart, and determine that the contaminant is between the connector and the port, when a sum of the differences that have been calculated for the plurality of diodes is a threshold or more.

8. The inspection system according to claim 1 , wherein the plurality of diodes is arranged in a matrix in certain intervals in the first direction and the second direction that is different from the first direction.

9. The inspection system according to claim 8 , wherein the processor is configured to: calculate, based on the intensity of the light for each of the locations of the plurality of diodes, a feature vector of the electrical signal, and determine whether the contaminant is between the connector and the port, based on the degree of similarity to the feature vector when the contaminant is not between the connector and the port and the degree of similarity to the feature vector when the contaminant is between the connector and the port.

10. An inspection method executed by an inspection system including a connector coupled to a plurality of optical fibers, a detection device arranged between the connector and a port of a computer, and a determination device coupled to the detection device and configured to determine whether a contaminant is between the connector and the port, the inspection method comprising: guiding, by the detection device, a light, passed through the plurality of optical fibers and output from the connecter, in a first direction to the port and in a second direction to a plurality of diodes included in the detection device; converting, by the plurality of diodes the light to an electrical signal indicating intensity and distribution of the light; and determining, by a processor included in the determination device, whether the contaminant is between the connector and the port, based on the intensity and distribution of the light, which are indicated by the electrical signal; wherein the processor is configured to: detect first diodes that have received the light that was reflected by the contact surface among the plurality of diodes and second diodes that have not received the light that was reflected by the contact surface among the plurality of diodes, specify, in each of arrays of ones of the plurality of diodes, which are arranged in lines in the first direction, for each pair of the first diodes between which at least one of the second diodes is arranged, the number of the second diodes that are arranged between each pair of the first diodes, and determine that the contaminant is between the connector and the port when the number of the specified second diodes is different among the pairs of the first diodes.

11. The inspection method according to claim 10 , wherein the detection device includes a housing including two members having different refractive indexes, and a contact surface of the two members is arranged so as to be oblique to an optical path of the light that is output from each of the plurality of optical fibers.

12. The inspection method according to claim 10 , wherein the contact surface reflects the light that has been output from each of the plurality of optical fibers and the light that has been reflected by the port to cause the lights to enter the plurality of diodes.

13. The inspection method according to claim 12 , wherein the plurality of diodes is arranged such that the light has been reflected by the contact surface enters through at least one of the plurality of diodes where the contaminant is located.